High-pressure studies onC at room temperature

S. Meenakshi, V. Vijayakumar, R. Rao, B. Godwal, S. Sikka, P. Ravindran

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The electronic and lattice structure, and equation of state behavior of (Formula presented)C has been investigated by electrical resistivity, thermoelectric power, and angle-dispersive x-ray-diffraction measurements. The electrical resistance under pressure has also been measured for other lanthanide-nickel borocarbides (Formula presented) Er, and Tm). The high pressure behavior is analyzed by electronic band-structure [tight-binding linear muffin-tin orbital (LMTO) and full-potential LMTO] calculations on (Formula presented) The measured thermoelectric power shows a peak around 2 GPa pressure. X-ray powder diffraction measurements of the lattice parameter under pressure reveal that the carbon-filled variant of (Formula presented)-type tetragonal structure prevailing under ambient conditions is preserved in (Formula presented) up to 6 GPa. Pressure-volume data on (Formula presented) yielded a bulk modulus of 200 GPa. This is in agreement with the value computed by the first-principles electronic-structure calculations. It is also shown that the observed peak in the thermoelectric power in (Formula presented) and the weak pressure dependence of the superconducting-transition temperature can be correlated with the details of the electronic density of states.

Original languageEnglish
Pages (from-to)3377-3380
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number6
DOIs
StatePublished - 1 Jan 1998
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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